Gladiator beast war chariot VS Blackwing- Gust the Backblast

This is a scenario i had encountered yesterday.

My LP left: 600

I special summoned my laquari = atk 2100 with chariot set.

After oponnent special summoned backblast , he ended with a set card.

Next , My laquari attacked backblast and he opened shrink. Backblast def = 1400
Laquari attk = 1050 -300(from back blast effect) = 750

Thus, i suffered damage of 650 n lost the game.

However, if i were to activate GB war chariot , can the effect of backblast be negated? meaning laquari attk only cut down by shrink and backblast is destroyed by chariot.

Thanks.

the effect of backblast will CANNOT be negated by chariot. Its not activation.